Adjustable die holder



July 24, 1928.

` J. J.` BOAX ADJUSTABLE DIE HOLDER Filed Oct. 26, 1926 July 24, 1928. 1,678,000

. J.. J. BoAx ADJUSTABLE DIE HOLDER Filed 001'.. 26, 1926 2 Sheets-Sheet 2 Patented July 24, 1928.

UNITED STATES PATENT OFFICE.

TOEN J'. BOAX, OF MCKEESPORT, PENNSYLVANIA, ASSIGNOR TO NATIONAL TUBE COMPANY, A CORPORATION OF NEW JERSEY.

ADJUSTABLE DIE HOLDER.

Applicationv filed October 26, 1926. Serial No. 144,304.

This invention .relates to die holders for` ipe threading machines, and while not iimited thereto, relates more particularly to the adjusting mechanism for such dies, and has for its object the provision of a novel form of adjusting mechanism whereby the opposite die 'shoes may be adjusted independent of each other in order to obtain a proper position of the dies.

Another object is to provide an improved adjusting mechanism'whereby the die may be readily assembled and adjusted since each shoe may be separately adjusted.

Another object is to provide a novel formy of gage adapted, to be removably secured to the die holder and against which the die shoes may be separately adjusted to form a perfect1 circle.

A further object is to provide a die holder y having the novel construction, design and combination of parts hereinafter described and illustrated. j

In the drawings:

Figurek 1 is an elevation showing a die holder constructed in accordance with this invention mounted on the carriage of a standard pipe threading machine.

Figure 2 1s a sectional view taken on the line 1I`II of Figure 1. f Figure 3 is a sectional view taken' on the line III-'JIT of Figure 1.

Figure`4is a sectional view taken on the line lIV-IV of Figure 3.

Figure 5 is a sectional view taken on the line V-V of Figure 3.

Referring moreparticularly to the drawings, the numeral 2 designates the carriage of a standard pipe threading machine. A die shoe holder 3is mounted 1n a transverse slide which forms part of the standard threading'machine carriage 2.

A pair of semi-circular die shoes 5 and 6 7 are mounted on the die shoe holder 3 by bolts 7, 8, 9 and 10. The bolts 7 and 8 are shouldered pvotl bolts which extend through pivot holes in one end of the shoes 5 and 6,

and have their rear ends extending through the shoe holder 3 and secured in position by nuts 12. The forward ends ofthe bolts 7 and 8 extend through a gib plate 13 and are tends through the gib plate 13 and 'thevshoe holder 3.

slots 16 and 17 through which the shouldered bolts 9 and 10,y respectively, are mounted. The bolts 9 and 10 extend through the shoe rholder 3 and through the slots 16 and 17,

Dueto the bolts 7, 8, 9 and 10 -all being fshouldered, the nuts on their ends may be tightened against the gib plates 13 and 18 and the die shoe holder 3 without binding the die'shoes 5- and 6.

The free ends of the die shoes 5 and 6 opposite the bolts 7 and 8 are provided with verticajlly disposed openings 20 there' through, which are intersected by horizontally/disposed nuts 2l which are revolvably jmounted in horizontal apertures 22.

AnE adjusting screw 23 is in threaded engagement with the nuts 21 and comprises a main body or shank portion v24s having a right-hand thread 25 formed thereon, and a reduced stem portion 26 on which is mounted a sleeve 27 having a left-hand thread 28 thereon. The sleeve 27 is adapted to be locked against rotation on the stem 26 by a -washer 29which is splined on the reduced lower end 30 of the stem 26, and has a 'serrated face 31 adapted to engage the serrated lower end 32 of the sleeve 27. A split lock-washer 33 and nut 34 are mounted on the reduced end 30 of the stem 26 to lock he Washer 29I in position against the sleeve The screw 23 `is provided with a bearing portion 35 intermediate its ends between t'he threaded portion 25 and the sleeve 27 which bea-ring portion terminates at each lend in an integral thrust-collar 36.

A split bearing block 37 having a bearing slot 38 is secured to the die shoe holder 3 between the free ends of the die shoes 5 and 6 by bolts 39, and a split bearin member 40 f is `slidably mounted therein. T ebearing 40 has its periphery slotted to form overlapping peripheral anges 41 adapted tov overlie and cover the slot 38 in the bearing block 37 to prevent cuttings or other foreign matter entering the slot.

" both die shoes in unlson.

- to the vertical center lthe gage will then be positioned on the die,

f-.adjust the die shoes to it The screw 23 is adapted to have its bearing portion 35 journaled in the bearing 40, and the thrust-flanges or Collars 36 are adapted to bear against the side aces of the bearing 40.

*"In' operation, the 4vwear of the thrust-col'- lars 36 as the screw 23 "is rotated is taken by the bearing 40, and the wear vcaused by sliding movement of the bearin`g'404 due to the changing of' the vertical position of. the screw23 as the die shoes are moved, is also taken by the ybearing 4Q: Therefore, when sufficient ywear has been .had to effect the operation of thedevice the bearing 40 may be readily replaced. The upper en d of with a crank or handle same.

yThe operation of the screw is as follows: Assuming that the die is to be assembled, the die shoes 5 and 6 will be assembled on the die shoe holder, and the adjusting screw 23 willbe disassembled. The nut- 21 for the upper shoe 5 will then be positioned in the opening or, aperture 22, and the screw 23 will be threaded into the nut. The screw will then be mounted in the bearing 40, which bearing will then be mounted in the bearing block 37. The nut 21ffor the lower die shoe 6 will then be positioned in its aperture 22, and the sleeve 27 fitted over the stem 26 of the screw 23 and threaded in the screw .23 is provided 42 for turning the this nut 21. The screw 23 and sleeve 27 may be then operated independently until the die shoes are correctly positioned, when the washers 29, 33, and nut 34 may betightened into position to lock the sleeve 27 in position on the screw.

In the present drawings Ihave shown a gage for correctly positioning to die shoes 5 andA 6. The gage comprises a cross-bar 45 adapted .to be secured in position on the die by being litted over the bolts 15 and the innermost one of the bolts 39. A gage ring 46 is adjustably or-slidably mounted on the bar l45 'by bolts 47 which pass through horizontal slots 48 in the bar.

After the die has been assembled on a table or bench, it willbe mounted on the carriage of' a threading machine.

The die will then be centered by bringing the center of the die .line of the machine;

and. the adjusting screw will be operated to ring `46. If the die shoes are not correctly positioned, the nut 34 is loosened so as to Irelease. the washer 29 from the sleeve 27,

and the threaded portion 25 and sleeve 27 independently rotated until the shoes are v.correctly positioned to .fit the gage, after [which the nut 34 is .tightened so that the to move, said screw member at each end of'said bearadjusting screw. may.; be operated Aften the die shoes have'lb'een .properly around the gage -with a bearing pin 51, and the lug 50 is provided with an adjustable stop screw 52 adapted to engage the stop pin 51 to limit the closing position of the die shoes if necessary.

While Ihave shown and described one specific embodiment of my invention it will be understood that I do not wish to be limited thereto, since various moditications A may be made without departing from the scope `of my invention as defined in the appended claims.

I claim:

1. The combination with a die shoe holder,

and al pair of die shoes pivotally supported at one end on said die shoe holder, of means associated with the other end ,of said die shoes for moving said die shoes about said pivotal supports, said means including a nut revolvably mounted in each of said shoes, an adjusting screw member having right and left-hand threaded portions in threaded engagement with said nut members, one of said threaded portions being movable. relative to the other so that said die shoes may be independently adjusted, and means for locking said threaded portions togetherfor simultaneous operation.

2. The combination with a die shoe holder,

and a pair of die shoes pivotally supported at one end on said die shoe holder, of means associated with the other lend ot said die shoes for moving said die shoes about said pivotal supports, said means including a nut revolvably mounted in each of said shoes, an adjusting screw member j ournaled in a horizontally movably bearing slidably mounted in a bearing block secured to said die shoe holder, said adjusting screw having right and left-hand threaded portions in threaded engagement with said nut members, one of said threaded portions being movable relative to the other so that said die shoes may be independently adjusted, and means for locking said threaded portions together for simultaneous operation.

3. The combination with a die shoe holder, and a pair of die shoes .pivotally supported at one end on said die shoe holder, of means associated with the other end of said die shoes for moving said die shoes about said pivotal supports, said means including a nut revolvably mounted in each of said shoes, a split bearing block secured to said die shoe holder and having an elongated opening therein, an adjusting screw member having a bearing portion intermediate its ends, integral collar portions formed integral with ing portion, a two-'piece split bearing' fitted around the bearing ortion of said screw member between sai collar portions, said two-piece bearing being adapted to fit within the opening in said bearing block and being provided with peripheral flanges adapted to extend beyond and cover the opening in said block, said adjusting screw having right and left-hand threaded portions in threaded engagement with said nut members, one of said threaded portions bein movable relative to the other, so that sai die shoes may be independently adjusted, and means for locking said threaded portions together for simultaneous operation.

4. The combination `with a pair of elements movable toward and away from each v other, of nuts mounted in each of Said elements, an adjusting screw, said screw comprising a shank portion havingv a thread formed integral therewith and in engagement with one of said nuts, a reduced stem portion, a sleeve mounted on said stem portion and having an opposite hand thread formed thereon, said sleeve being in engagement with the other of said nuts, and means for detachably securing said sleeve 'against rotation on said stem.

5. The combination with a pair of elements movable toward and away from each other, of nuts mounted in each of said elements, an adjusting screw, said screw comprising a shank portion having a thread formed integral t erewith rand in engagement with one of said nuts, a reduced stem portion, a sleeve mounted on said stem portion and having an opposite hand thread .formed thereon, said sleeve being in en agement with the other of said nuts, said s eeve having its one end serrated, a serrated washer splined on said stem and adapted to cooperate with the serrated end of said sleeve to prevent the rotation of said sleeve relative to said stem, and a nut threaded on said stem and adapted to lock said washer in position.

v In testimony whereof, I have hereunto signed my name.

JOHN J. BOAX. 

